"""Test fixtures for the clean-bootstrap test suite (Task 20).

Boots a real FastAPI server via uvicorn subprocess so end-to-end paths
exercise the same wsgi/asgi stack as production (cookie sessions, PAT
verify, JWT, DB locks). Pre-seeds two users + three tables in the system
DB before the subprocess starts so the test can authenticate immediately.

Subprocess (not in-thread uvicorn): isolates the test's `DATA_DIR` and
the load-bearing module-level singletons in `src.db` (cached system DB
connection) and `app.instance_config` from the parent test runner. The
existing E2E pattern in tests/test_e2e_corporate_memory.py uses the same
shape; we reuse it here for the same reasons.

Public API:
- `fastapi_test_server` — yields `_ServerHandle` with `.url` + `.shutdown()`.
- `web_session` — `httpx.Client` authenticated as admin via the form-login
  endpoint (cookie session).
- `test_pat` — string PAT for analyst with grants to the `local` and
  `materialized` test tables.
- `test_pat_no_grants` — string PAT for analyst with zero grants.
- `zero_grants_workspace` — `Path` to a workspace where `agnes init` has
  run with `test_pat_no_grants` (no parquets, no rules).
- `NONEXISTENT_TABLE` — module constant for Task 21's smoke matrix.
"""

from __future__ import annotations

import os
import socket
import subprocess
import sys
import time
from dataclasses import dataclass
from pathlib import Path
from typing import Iterator

import httpx
import pytest


NONEXISTENT_TABLE = "__nonexistent__"

ADMIN_EMAIL = "admin@example.com"
ADMIN_PASSWORD = "test-admin-password-123"
ANALYST_EMAIL = "analyst@example.com"
ANALYST_PASSWORD = "test-analyst-password-123"

# Test table fixtures — one per query_mode the manifest filter cares about.
LOCAL_TABLE_ID = "local_tbl"
MATERIALIZED_TABLE_ID = "materialized_tbl"
REMOTE_TABLE_ID = "remote_tbl"


# ---------------------------------------------------------------------------
# Server handle
# ---------------------------------------------------------------------------


@dataclass
class _ServerHandle:
    url: str
    data_dir: Path
    proc: subprocess.Popen
    admin_user_id: str
    analyst_user_id: str
    everyone_group_id: str
    admin_group_id: str

    def shutdown(self) -> None:
        if self.proc.poll() is None:
            self.proc.terminate()
            try:
                self.proc.wait(timeout=5)
            except subprocess.TimeoutExpired:
                self.proc.kill()


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


def _find_free_port() -> int:
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind(("127.0.0.1", 0))
        return s.getsockname()[1]


def _seed_db(data_dir: Path) -> dict:
    """Open system.duckdb under DATA_DIR, run migrations, seed users + tables.

    Done before the uvicorn subprocess boots so:
    1. The test can immediately log in as admin/analyst (passwords set up).
    2. The subprocess inherits a ready DB on first request — no race between
       startup migrations and the test's first HTTP call.
    3. We close the parent's connection at the end so the subprocess can
       acquire DuckDB's file lock.
    """
    # Restrict the system-db path resolution to our tmp path. _seed_db
    # mutates module state in src.db; the caller's get_system_db() cache
    # is reset by tests/conftest._reset_module_caches but we still want
    # the subprocess child to see the same DATA_DIR.
    os.environ["DATA_DIR"] = str(data_dir)
    (data_dir / "state").mkdir(parents=True, exist_ok=True)
    (data_dir / "analytics").mkdir(parents=True, exist_ok=True)
    (data_dir / "extracts").mkdir(parents=True, exist_ok=True)

    # Defer imports until after DATA_DIR is set so any module that reads
    # the env at import time picks up our path.
    import uuid
    from argon2 import PasswordHasher

    from src.db import (
        SYSTEM_ADMIN_GROUP,
        SYSTEM_EVERYONE_GROUP,
        close_system_db,
        get_system_db,
    )
    from src.repositories.table_registry import TableRegistryRepository
    from src.repositories.user_group_members import UserGroupMembersRepository
    from src.repositories.users import UserRepository

    conn = get_system_db()
    try:
        ph = PasswordHasher()

        # --- Users -----------------------------------------------------
        users = UserRepository(conn)
        admin_id = str(uuid.uuid4())
        analyst_id = str(uuid.uuid4())
        users.create(
            id=admin_id, email=ADMIN_EMAIL, name="Admin Tester",
            password_hash=ph.hash(ADMIN_PASSWORD),
        )
        users.create(
            id=analyst_id, email=ANALYST_EMAIL, name="Analyst Tester",
            password_hash=ph.hash(ANALYST_PASSWORD),
        )

        # --- System groups (Admin / Everyone are seeded by _ensure_schema).
        admin_group_row = conn.execute(
            "SELECT id FROM user_groups WHERE name = ?", [SYSTEM_ADMIN_GROUP],
        ).fetchone()
        everyone_group_row = conn.execute(
            "SELECT id FROM user_groups WHERE name = ?",
            [SYSTEM_EVERYONE_GROUP],
        ).fetchone()
        assert admin_group_row, "Admin system group not seeded"
        assert everyone_group_row, "Everyone system group not seeded"
        admin_group_id = admin_group_row[0]
        everyone_group_id = everyone_group_row[0]

        members = UserGroupMembersRepository(conn)
        members.add_member(admin_id, admin_group_id, source="system_seed")
        # The analyst is in Everyone so RBAC checks against the Everyone
        # group resolve cleanly. Admin is implicitly in Everyone for
        # historical reasons but the marketplace filter treats Admin as a
        # regular group, so we add it explicitly to be unambiguous.
        members.add_member(admin_id, everyone_group_id, source="system_seed")
        members.add_member(analyst_id, everyone_group_id, source="system_seed")

        # --- Tables (one per query_mode) -------------------------------
        tables = TableRegistryRepository(conn)
        tables.register(
            id=LOCAL_TABLE_ID, name=LOCAL_TABLE_ID,
            source_type="keboola", bucket="test",
            source_table=LOCAL_TABLE_ID, query_mode="local",
        )
        tables.register(
            id=MATERIALIZED_TABLE_ID, name=MATERIALIZED_TABLE_ID,
            source_type="bigquery", bucket="test",
            source_table=MATERIALIZED_TABLE_ID, query_mode="materialized",
        )
        tables.register(
            id=REMOTE_TABLE_ID, name=REMOTE_TABLE_ID,
            source_type="bigquery", bucket="test",
            source_table=REMOTE_TABLE_ID, query_mode="remote",
        )

        # --- Parquet files + sync_state for non-remote tables -----------
        # The manifest builder iterates `sync_state` (not table_registry) and
        # `/api/data/{tid}/download` looks up parquet files under
        # `data_dir/extracts/.../data/`. Seeding both lets `agnes init`
        # exercise the full download path, not just the registry-only stub.
        # Each parquet is a single-row DuckDB COPY — minimal but valid (PAR1
        # magic + metadata) so client-side `_is_valid_parquet` passes.
        from src.repositories.sync_state import SyncStateRepository
        sync_repo = SyncStateRepository(conn)
        extracts_data = data_dir / "extracts" / "test" / "data"
        extracts_data.mkdir(parents=True, exist_ok=True)
        for tid in (LOCAL_TABLE_ID, MATERIALIZED_TABLE_ID):
            parquet_path = extracts_data / f"{tid}.parquet"
            # COPY ... TO creates a real parquet via DuckDB's writer.
            conn.execute(
                f"COPY (SELECT 1 AS id, 'sample' AS label) "
                f"TO '{parquet_path}' (FORMAT PARQUET)"
            )
            # Compute MD5 the same way `app/api/sync.py:_file_hash` and
            # `cli/lib/pull.py:_file_md5` do — chunked 8k reads.
            import hashlib
            h = hashlib.md5()
            with open(parquet_path, "rb") as fh:
                for chunk in iter(lambda: fh.read(8192), b""):
                    h.update(chunk)
            sync_repo.update_sync(
                table_id=tid,
                rows=1,
                file_size_bytes=parquet_path.stat().st_size,
                hash=h.hexdigest(),
            )
    finally:
        conn.close()

    # CRITICAL: release DuckDB's file lock so the uvicorn subprocess can
    # open the DB. The parent's cached connection is held by src.db at
    # module level; without close_system_db() the child blocks forever
    # on its first get_system_db() call.
    close_system_db()

    return {
        "admin_user_id": admin_id,
        "analyst_user_id": analyst_id,
        "admin_group_id": admin_group_id,
        "everyone_group_id": everyone_group_id,
    }


def _wait_for_server(url: str, timeout_s: float = 30.0) -> None:
    """Poll /api/health until the server answers 200 or timeout."""
    deadline = time.monotonic() + timeout_s
    while time.monotonic() < deadline:
        try:
            resp = httpx.get(f"{url}/api/health", timeout=1.0)
            if resp.status_code == 200:
                return
        except Exception:
            pass
        time.sleep(0.2)
    raise RuntimeError(f"Server at {url} not ready within {timeout_s}s")


def _login_session(server_url: str, email: str, password: str) -> httpx.Client:
    """Form-login and return an httpx.Client with the access cookie set.

    The /auth/password/login/web endpoint sets `access_token` as an
    HttpOnly cookie and 302s to /dashboard. Using `follow_redirects=False`
    means we capture the cookie without chasing the redirect chain.
    """
    client = httpx.Client(base_url=server_url, follow_redirects=False, timeout=10.0)
    resp = client.post(
        "/auth/password/login/web",
        data={"email": email, "password": password},
    )
    assert resp.status_code == 302, (
        f"login expected 302 redirect, got {resp.status_code}: {resp.text[:300]}"
    )
    # Sanity: the redirect Location must NOT carry ?error=invalid (form-login
    # bounces back to /login/password on bad creds with status 302 too).
    target = resp.headers.get("location", "")
    assert "error=" not in target, f"login failed: redirected to {target}"
    return client


def _mint_pat(server_url: str, email: str, password: str, *, name: str) -> str:
    """Log in as the user via web-form, then POST /auth/tokens.

    Returns the raw JWT (returned exactly once by the create endpoint).
    PATs cannot mint other PATs (require_session_token), so we must use a
    cookie session, not a previously-minted PAT.
    """
    session = _login_session(server_url, email, password)
    try:
        resp = session.post(
            "/auth/tokens",
            json={"name": name, "ttl_seconds": 3600},
        )
        assert resp.status_code == 201, (
            f"PAT mint failed: {resp.status_code} {resp.text[:300]}"
        )
        token = resp.json().get("token")
        assert token and isinstance(token, str), f"no token in response: {resp.text}"
        return token
    finally:
        session.close()


def _grant_table_access(web_session: httpx.Client, group_id: str, table_id: str) -> None:
    """POST /api/admin/grants for `(group, "table", table_id)`.

    Idempotent: a 409 from the unique constraint is swallowed so the
    fixture can be reused with a pre-existing grant.
    """
    resp = web_session.post(
        "/api/admin/grants",
        json={
            "group_id": group_id,
            "resource_type": "table",
            "resource_id": table_id,
        },
    )
    if resp.status_code not in (201, 409):
        raise AssertionError(
            f"grant create failed: {resp.status_code} {resp.text[:300]}"
        )


# ---------------------------------------------------------------------------
# Fixtures
# ---------------------------------------------------------------------------


@pytest.fixture
def fastapi_test_server(tmp_path: Path) -> Iterator[_ServerHandle]:
    """Boot a real FastAPI server in a uvicorn subprocess against tmp_path DATA_DIR.

    Pre-seeds:
    - Two users: admin@example.com (Admin group) and analyst@example.com
      (Everyone group only). Both have argon2-hashed passwords usable via
      `/auth/password/login/web`.
    - Two system groups (Admin, Everyone) — created by `_ensure_schema`.
    - Three tables in `table_registry`, one per query_mode (local,
      materialized, remote).

    The subprocess inherits `DATA_DIR=tmp_path/agnes-data` plus whatever
    `JWT_SECRET_KEY` / `TESTING` is in the environment, so the parent
    process can verify JWTs against the same secret it issued.

    Port is allocated via `_find_free_port` so xdist workers don't
    collide. Server is shut down via SIGTERM in the fixture teardown.
    """
    data_dir = tmp_path / "agnes-data"
    data_dir.mkdir(parents=True, exist_ok=True)
    seeded = _seed_db(data_dir)

    port = _find_free_port()
    url = f"http://127.0.0.1:{port}"

    env = os.environ.copy()
    env["DATA_DIR"] = str(data_dir)
    env["TESTING"] = "1"
    env["JWT_SECRET_KEY"] = os.environ.get(
        "JWT_SECRET_KEY", "test-secret-key-minimum-32-characters!!"
    )
    # Disable LOCAL_DEV_MODE — the smoke test must exercise real auth.
    env.pop("LOCAL_DEV_MODE", None)

    proc = subprocess.Popen(
        [sys.executable, "-m", "uvicorn", "app.main:app",
         "--host", "127.0.0.1", "--port", str(port), "--log-level", "warning"],
        env=env,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )

    try:
        _wait_for_server(url)
    except RuntimeError:
        proc.terminate()
        try:
            stdout = proc.stdout.read().decode("utf-8", errors="replace") if proc.stdout else ""
        except Exception:
            stdout = "<unreadable>"
        proc.wait(timeout=2)
        pytest.fail(f"fastapi_test_server failed to start on {url}\nstdout:\n{stdout[:3000]}")

    handle = _ServerHandle(
        url=url,
        data_dir=data_dir,
        proc=proc,
        admin_user_id=seeded["admin_user_id"],
        analyst_user_id=seeded["analyst_user_id"],
        admin_group_id=seeded["admin_group_id"],
        everyone_group_id=seeded["everyone_group_id"],
    )
    try:
        yield handle
    finally:
        handle.shutdown()


@pytest.fixture
def web_session(fastapi_test_server: _ServerHandle) -> Iterator[httpx.Client]:
    """Authenticated httpx.Client (cookie session) for admin@example.com.

    Cookies persist across requests on the same client, so subsequent
    requests against admin-gated endpoints (e.g. POST /api/admin/grants)
    succeed without re-attaching the JWT.
    """
    client = _login_session(
        fastapi_test_server.url, ADMIN_EMAIL, ADMIN_PASSWORD,
    )
    try:
        yield client
    finally:
        client.close()


@pytest.fixture
def test_pat(
    fastapi_test_server: _ServerHandle,
    web_session: httpx.Client,
) -> str:
    """Mint a PAT for analyst@example.com with two table grants.

    Grants applied (to the Everyone group, which the analyst is a member
    of): `local_tbl` and `materialized_tbl`. The third seeded table
    (`remote_tbl`) is intentionally left ungranted so smoke matrices can
    distinguish "remote skip" from "no access".

    Memory items / mandatory rules: not seeded by this fixture; Tasks 21
    and 22 will add them when needed via the same `web_session` admin
    client. Keeping memory off the critical path makes the fixture
    cheaper and the failure surface smaller.
    """
    everyone_id = fastapi_test_server.everyone_group_id
    _grant_table_access(web_session, everyone_id, LOCAL_TABLE_ID)
    _grant_table_access(web_session, everyone_id, MATERIALIZED_TABLE_ID)

    return _mint_pat(
        fastapi_test_server.url,
        ANALYST_EMAIL, ANALYST_PASSWORD,
        name="test-pat-with-grants",
    )


@pytest.fixture
def test_pat_no_grants(fastapi_test_server: _ServerHandle) -> str:
    """Mint a PAT for analyst@example.com with no resource_grants.

    The analyst is still in the Everyone group (so they can authenticate
    and call /api/sync/manifest), but no group they belong to has any
    table grants. The manifest will return zero tables; `agnes init`
    completes (no manifest_unauthorized error) with an empty workspace.
    """
    return _mint_pat(
        fastapi_test_server.url,
        ANALYST_EMAIL, ANALYST_PASSWORD,
        name="test-pat-no-grants",
    )


@pytest.fixture
def zero_grants_workspace(
    tmp_path: Path,
    fastapi_test_server: _ServerHandle,
    test_pat_no_grants: str,
) -> Path:
    """Run `agnes init` with the no-grants PAT; return the workspace path.

    Subprocess invocation (not in-process Typer call) so the test
    exercises the same path the paste-prompt installer uses. The CLI
    binary is the editable install at `.venv/bin/agnes`; we pass
    `AGNES_CONFIG_DIR=<tmp>/agnes-config` so this test does not stomp on
    the developer's `~/.config/agnes/`.
    """
    workspace = tmp_path / "workspace"
    workspace.mkdir()
    config_dir = tmp_path / "agnes-config"
    config_dir.mkdir()

    # Always invoke via `python -m cli.main` rather than the .venv/bin/agnes
    # console-script shim. The shim reads `from cli.main import app`, which
    # depends on `_editable_impl_agnes_the_ai_analyst.pth` being on disk and
    # discoverable. On macOS + iCloud Drive, the leading-underscore .pth
    # files get re-hidden by the system between unrelated tasks and the
    # shim then fails with `ModuleNotFoundError: No module named 'cli'`.
    # `python -m` uses the same interpreter without depending on .pth-file
    # visibility for CLI dispatch, so it is robust against that race.
    cmd: list[str] = [sys.executable, "-m", "cli.main"]

    env = os.environ.copy()
    env["AGNES_CONFIG_DIR"] = str(config_dir)
    env["AGNES_LOCAL_DIR"] = str(workspace)

    result = subprocess.run(
        cmd + [
            "init",
            "--server-url", fastapi_test_server.url,
            "--token", test_pat_no_grants,
            "--workspace", str(workspace),
        ],
        env=env,
        capture_output=True,
        text=True,
        timeout=60,
    )
    assert result.returncode == 0, (
        f"agnes init failed (exit={result.returncode}):\n"
        f"--- stdout ---\n{result.stdout}\n"
        f"--- stderr ---\n{result.stderr}"
    )
    return workspace